Remove render-image override

We can just use the resource shortcode in content files

hugo.yaml

@@ -4,8 +4,6 @@ markup:
     lineNos: true
   goldmark:
     parser:
-      # don't put <p> around ![]() image in markdown (used to embed any resource now)
-      wrapStandAloneImageWithinParagraph: false
       attribute:
         block: true
         # this is enabled by default already

layouts/_markup/render-image.html

@@ -1,12 +0,0 @@
-{{/* TODO: should we use .PageInner */}}
-{{ partial "embed-resource.html" (.Page.Resources.Get .Destination) }}
-{{ with .Title }}
-    {{ errorf "%q" . }}
-{{ end }}
-{{ with .Attributes }}
-    {{/* FIXME: https://github.com/gohugoio/hugo/blob/master/tpl/tplimpl/embedded/templates/_markup/render-image.html */}}
-    {{ errorf "%q" . }}
-{{ end }}
-{{ with .Text }}
-    {{ errorf "%q" . }}
-{{ end }}